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Environmental changes are affecting the Arctic at an unprecedented rate, but limited scientific knowledge exists on their impacts on species such as walruses (Odobenus rosmarus). Inuit Traditional and Local Ecological Knowledge (Inuit TEK/LEK) held by Inuit walrus harvesters could shed light on walrus ecology and related environmental changes. Our main objective was to study spatial and temporal changes in Atlantic walrus (Odobenus rosmarus rosmarus) distribution in Nunavik (northern Québec, Canada) using Inuit TEK/LEK. To do so, we documented the knowledge and observations of 33 local hunters and Elders as part of a larger project on Atlantic walruses in Nunavik. We first gathered information on changes in Inuit land use patterns and harvesting practices through time and space, which was a crucial step to avoid potential biases in interpreting local observations on walrus distribution. We found that walrus hunters are now covering smaller hunting areas over shorter time periods, reducing in space and time their observations of Atlantic walruses around Nunavik. While clearly taking these limitations into account, we learned from interviews that some areas abandoned by Atlantic walruses in the past were now being re-occupied. Importantly, Atlantic walruses, which migrate following the melting ice, are now traveling along the eastern coast of Nunavik one month earlier, suggesting that Atlantic walrus migration has changed due to variations in sea-ice coverage around Nunavik. Our study not only highlighted important changes in Atlantic walrus distribution and migration in Nunavik, but also sheds light on the importance of documenting temporal and spatial changes in Inuit land use patterns and harvesting practices to understand the ecology of Arctic species using Inuit Knowledge. Supplementary Information The online version contains supplementary material available at 10.1007/s00300-021-02920-6.

Traditional and local ecological knowledge (TEK/LEK) are important sources of information for wildlife conservation. However, there are often limitations and biases in the TEK/LEK methods used. In this study, we examined and implemented strategies to address the limitations and biases we identified while analyzing the mapped observations collected from 27 interviews as part of a larger project on walruses in Nunavik (Canadian Arctic). Our main objectives were to: (1) examine the importance of recording participants’ temporal and spatial limits of observations; (2) identify the factors influencing the quantity and diversity of mapped observations; (3) study the importance of documenting approximate numbers of animals observed; (4) examine the importance of gathering and presenting data at consistent and standardized spatial scales. We found that by adding to maps the geographic limits of participants’ common areas of observations, we were able to distinguish areas that hunters typically visited and did not see walruses, from areas that hunters never visited. Furthermore, we showed that the variability in the quantity of mapped observations was explained by the community of residence and average number of hunting trips per participant, but not by participant age. Finally, although careful adjustments and standardization would be needed, we showed that by having an estimate of the number of walruses observed per area drawn, it would be possible to estimate mean local abundances of walruses. We hope this careful examination of TEK/LEK methods will help to increase confidence in these datasets as a valuable source of knowledge for wildlife conservation.